Trong sự phân hoá theo đông - tây của thiên nhiên nước ta không có một vùng (bộ phận) nào sau đây?

Cho tứ diện ABCD có tất cả các cạnh bằng a. Gọi \({G_1},{G_2}\) lần lượt là trọng tâm tam giác BCD và ACD. Khi đó đoạn thẳng \({G_1}{G_2}\) bằng:  

Theo Hiến pháp 1791 nước Pháp lựa chọn theo thể chế chính trị nào?

Cho hàm số bậc bốn $y=f\left(x\right)$ có đồ thị như hình vẽ. Số điểm cực trị của hàm số $g\left(x\right)=f(x^3-3x^2)$ là?

Phát biểu nào sau đây là đúng khi nói về phương pháp tách kim loại ra khỏi hợp chất của chúng?

Phản ứng chuyển hoá giữa hai dạng đơn chất của phosphorus (P):

P (s, đỏ) ⟶ P (s, trắng)          \({\Delta _r}H_{298}^o = 17,6kJ\)      

Điều này chứng tỏ phản ứng:

Sau năm 1991, quốc gia nào sau đâu không đi theo con đường xã hội chủ nghĩa?

Hình dưới đây minh họa kiểu gene, cấu trúc NST và các kiểu hình tương ứng về hình dạng mắt ở ruồi giấm cái. Sự biểu hiện kiểu hình khác thường do đột biến lặp đoạn vùng Bar trên nhiễm sắc thế giới tính X và NST bình thường (kí hiệu B⁺), NST đột biến lặp mang 1 và 2 đoạn Bar được kí hiệu lần lượt B và B^D. Hậu quả của đột biến này làm cho mắt lồi thành mắt dẹt, nếu đoạn NST lặp lại càng nhiều lần thì mức độ dẹt của mắt càng tăng lên.

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Ruồi giấm dị hợp tử đột biến (B⁺B) có kiểu hình nào sau đây?

Khi được thần Prô - mê - tê trao tặng ngọn lửa, con người đã có thái độ như thế nào?

Lực lượng nào trong xã hội Anh giàu lên nhanh chóng nhờ sự phát triển của ngoại thương?

Trong không gian Oxyz, cho các điểm \(A(1;1;2)\) và \(B(4;5;1)\). Các điểm M, N di động trên mặt phẳng \((Oxy)\) sao cho \(MN=1\). Tổng \(AM+BN\) có giá trị nhỏ nhất là bao nhiêu (nhập đáp án vào ô trống)?

Tôn giáo nào du nhập từ bên ngoài vào Ấn Độ?

Cho 2 số thực dương \(a, b\) thỏa mãn \(a+b=5 a b\). Khẳng định nào sau đây là khẳng định đúng ?

Read the passage below and choose A, B, C or D.

Although noise, commonly defined as unwanted sound, is a widely recognized form of pollution, it is very difficult to measure because the discomfort experienced by different individuals is highly subjective and, therefore, variable. Exposure to lower levels of noise may be slightly irritating, whereas exposure to higher levels may actually cause hearing loss. Particularly in congested urban areas, the noise produced as a by-product of our advancing technology causes physical and psychological harm, and detracts from the quality of life for those who are exposed to it.

Unlike the eyes, which can be covered by the eyelids against strong light, the ear has no lid, and is, therefore, always open and vulnerable; noise penetrates without protection. Noise causes effects that the hearer cannot control and to which the body never becomes  accustomed. Loud noises instinctively signal danger to any organism with a hearing mechanism, including human beings. In response, heartbeat and respiration accelerate, blood vessels constrict, the skin pales, and muscles tense. In fact, there is a general increase in functioning brought about by the flow of adrenaline released in response to fear, and some of these responses persist even longer than the noise, occasionally as long as thirty minutes after the sound has ceased.

Because noise is unavoidable in a complex, industrial society, we are constantly responding in the same way that we would respond to danger. Recently, researchers have concluded that noise and our response may be much more than an annoyance. It may be a serious threat to physical and psychological health and well-being, causing damage not only to the ear and brain but also to the heart and stomach. We have long known that hearing loss is America's number one nonfatal health problem, but now we are learning that some of us with heart disease and ulcers may be victims of noise as well. Fetuses exposed to noise tend to be overactive, they cry easily, and they are more sensitive to gastrointestinal problems after birth. In addition, the psychic effect of noise is very important. Nervousness, irritability, tension, and anxiety increase affecting the quality of rest during sleep, and the efficiency of activities during waking hours, as well as the way that we interact with each other.

Based on the passage, how does noise affect psychological and physical health in industrial societies?

Sự phân bố các điểm dân cư nông thôn thường được biểu hiện bằng phương pháp gì?

Nét nổi bật của tình hình nước Nga sau Cách mạng tháng Hai năm 1917 là gì? 

Read the following passage about endangered languages and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questionsfrom 31 to 40.

[I] Social media has become a dominant force in modern communication, offering a range of benefits and challenges. [II] It has revolutionized the way people interact, share information, and even form relationships. [III] While these platforms offer opportunities for connection and expression, they also have their drawbacks. [IV] For instance, excessive use of social media has been linked to a range of negative effects, including mental health issues, social isolation, and decreased productivity. [V] However, when used responsibly, social media can also offer a variety of positive outcomes, such as the ability to stay connected with loved ones, network professionally, and access valuable information and resources.

One of the major benefits of social media is its ability to keep people connected. For example, individuals who live far apart can maintain close relationships through regular communication on these platforms. Social media also facilitates professional networking, allowing users to connect with potential employers or clients, and enabling companies to promote their products and services to a global audience. Additionally, platforms like Facebook, Twitter, and Instagram provide a space for people to share ideas, opinions, and creative work, fostering a sense of community and collaboration.

Despite these advantages, there are serious concerns about the negative impact of social media, particularly on mental health. Studies have shown that excessive social media use can contribute to feelings of anxiety, depression, and loneliness. This is often attributed to the unrealistic portrayals of life that are commonly shared on these platforms, leading to comparisons that can make individuals feel inadequate or left out. Furthermore, constant exposure to negative news or online bullying can exacerbate these feelings and contribute to long-term psychological stress.

Another issue with social media is its potential to distract people from their daily responsibilities. With notifications constantly popping up and endless streams of content to scroll through, individuals may find it difficult to focus on tasks such as work, school, or personal obligations. This can result in decreased productivity and a lack of attention to important matters.

Ultimately, the impact of social media depends on how it is used. If individuals are mindful of their usage patterns and take steps to limit their time on these platforms, they can enjoy the benefits of staying connected and informed without the negative consequences. Parents, educators, and mental health professionals can also play a role in helping young people develop healthy habits and manage their social media use effectively.

According to passage, which of the following is NOT a benefit of social media?